A superseding indictment, returned Thursday in federal court, has added 13 more defendants for their roles in an alleged sex trafficking and prostitution ring stretching from Mexico to Georgia, to Florida, to the Carolinas, and elsewhere. In total, 25 defendants have now been charged in the superseding indictment, which follows the original 12-defendant indictment returned in January.

The federal charges follow a lengthy investigation dubbed “Operation Dark Night,” which was led by U.S. Immigration and Customs Enforcement’s Homeland Security Investigations. In addition to the number of arrests and searches in January 2013, federal authorities rescued a number of women alleged to have been forced into prostitution, according to the U.S. Attorney for the Southern District of Georgia.

The investigation of this cases remains ongoing. The names of the newly indicted have not been released by the Department of Justice.

U.S. Attorney Edward Tarver said: “The superseding indictment adds even more gruesome details to the allegations of an already reprehensible human trafficking ring operating within our very own communities. The U.S. Attorney’s Office and our law enforcement partners will not stop until all of those responsible are brought to justice.”

“The superseding indictment alleges that this sex trafficking ring was even more extensive and ruthless,” said Brock D. Nicholson, special agent in charge of ICE Homeland Security Investigations in Atlanta. “Over a dozen new suspects, including “johns,” have now been added. Of more concern are new allegations that members of this conspiracy arranged to hold some of their victims’ children hostage in Mexico to ensure their compliance as prostitutes in the United States.

"The investigation in Operation Dark Night will continue until we have rooted out all of the bad actors in this conspiracy and have brought them to justice.”

According to allegations in the superseding indictment, some of the defendants would entice women from Mexico and elsewhere to travel to the United States with false promises of the American dream. Once inside the United States, these women were allegedly threatened and forced to commit acts of prostitution at numerous locations in Savannah and throughout the southeast.

In particular, some members of the conspiracy are alleged to have held children hostage in Mexico to force certain women to engage in prostitution. Women were alleged forced to perform as many as 25 acts of prostitution a day.

Operation Dark Night was led by HSI, with assistance from the FBI; the ATF; U.S. Customs and Border Protection (CBP); CBP Air and Marine Operations; Coast Guard Investigative service (CGIS); IRS-Criminal Investigations; the Savannah-Chatham Metropolitan Police Department; the Chatham County Sheriff’s Office; the Garden City Police Department; and, the Chatham County Counter Narcotics Team. Assistant United States Attorneys Tania D. Groover and E. Greg Gilluly, Jr. are prosecuting the case on behalf of the United States.